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EleoNora [17]
3 years ago
15

Measure the length of the mouse as shown in millimeters and in centimeters.

Mathematics
1 answer:
GREYUIT [131]3 years ago
8 0
I would need the know the length to put it in milli and centi
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The mean preparation fee H&R Block charged retail customers in 2012 was $183 (The Wall Street Journal, March 7, 2012). Use t
astraxan [27]

Answer:

a)0.6192

b)0.7422

c)0.8904

d)at least 151 sample is needed for 95% probability that sample mean falls within 8$ of the population mean.

Step-by-step explanation:

Let z(p) be the z-statistic of the probability that the mean price for a sample is within the margin of error. Then

z(p)=\frac{ME*\sqrt{N}}{s } where

  • Me is the margin of error from the mean
  • s is the standard deviation of the population
  • N is the sample size

a.

z(p)=\frac{8*\sqrt{30}}{50 } ≈ 0.8764

by looking z-table corresponding p value is 1-0.3808=0.6192

b.

z(p)=\frac{8*\sqrt{50}}{50 } ≈ 1.1314

by looking z-table corresponding p value is 1-0.2578=0.7422

c.

z(p)=\frac{8*\sqrt{100}}{50 } ≈ 1.6

by looking z-table corresponding p value is 1-0.1096=0.8904

d.

Minimum required sample size for 0.95 probability is

N≥(\frac{z*s}{ME} )^2 where

  • N is the sample size
  • z is the corresponding z-score in 95% probability (1.96)
  • s is the standard deviation (50)
  • ME is the margin of error (8)

then N≥(\frac{1.96*50}{8} )^2 ≈150.6

Thus at least 151 sample is needed for 95% probability that sample mean falls within 8$ of the population mean.

7 0
3 years ago
Lines l and k are parallel to each other. mA=120 degrees. and mC=80 degrees. What is the number of degrees in mB??
djverab [1.8K]

Answer:

45

Step-by-step explanation:

6 0
3 years ago
A swimming pool is in the shape of a right triangle. One leg has a length of 15 feet and the hypotenuse is √325 feet. Estimate t
laiz [17]

Answer:

10 feet

Step-by-step explanation:

a^2+b^2=c^2

15^2+B^2=365

225+b^2=365

b^2=100

b=10

6 0
3 years ago
What is an equation that passes through -1,2 and is parallel to the point 3x+y=3 ?​
pentagon [3]

Answer:

y=3x+5

Step-by-step explanation:

For this you can use the point-slope formula: y-y1=m(x-x1). Since the line we're looking for is parallel,  both slopes are equivalent.

First, you have to rewrite the primary equation into standard form, which would rewrite to y=3-3x or y=-3x+3. Then, you can use the information we have in the point-slope formula:

y-(2)=3(x+1)

y-2=3x+3

y=3x+5

Check:

(2)=3(-1)+5

2=-3+5

2=2

8 0
3 years ago
We are to estimate the confidence interval for a population proportion p, based on two samples A and B of sizes 100 and 200, res
WITCHER [35]

Answer:

The option B is True

Step-by-step explanation:

Solution

nA  < nB

Thus

1/√nA > 1/√nB

SD/√nA  > SD/√nB

So,

SE (A) > SE (B).......(1)

Zα/2 SE (A) > Zα/2 SE (B)

Now

E (A) > E(B)  this is the margin error

Since SE fro sample A is larger than SE for sample B

We have that,

The length = ZE

Therefore, option B is correct because here, we know that as the sample size increases or goes higher  the length of the confidence interval decreases

In this case, the  sample size is large for B then A.

Thus, the length of confidence interval based on A is larger than the length of confidence interval Based on B Since SE is large For A than B

7 0
3 years ago
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